When the --no-cython option is given, it is no longer an error when
derived files are older than source files.

Error messages have been improved.

The file kwant/_static_version.py is no longer written upon every
invocation of setup.py.  Instead, a file kwant/_kwant_version.py is
injected into source and binary distributions.

The static version in kwant/_kwant_version.py now takes precedence
before any version from git.  This makes the --no-git option to setup.py
no longer necessary, since the existence of kwant/_kwant_version.py has
the same role.  The motivation behind this change is to allow keeping
Kwant distributions in git repositories that have a different layout
from the canonical Kwant git repository.  This is useful for example for
packaging.

The name of the static version file was changed to avoid problems with
stale files.

See also commit 5e0f06d3.

Joseph Weston authored 9 years ago and Christoph Groth committed 9 years ago

The fact that this test was broken was not seen before because
in Python 2 dictionaries have the same sort-order on subsequent
program runs. This is not the case for Python 3.

This is useful when the source is held in a git repository but this
repository is not an usual kwant repository.

This still does not allow to import kwant under other names:
http://thread.gmane.org/gmane.comp.python.cython.user/13809

Once we depend on Python 3.5, and "proper" relative cimports are supported by
Cython, we could add a test for exclusive use of relative imports.

Conflicts:
	kwant/physics/leads.py

Joseph Weston authored 9 years ago and Christoph Groth committed 9 years ago

Before this commit, if there was a lead for which
the inter-cell hopping matrix was the zero matrix, then
kwant.physics.modes() returned arrays with uninitialized memory.